ARSENIC STANDARD SOLUTION (10 ppm As

METHOD OF PREPARATION: 

Dissolve 0.330 gm of Arsenic Trioxide in 5 ml of 2 M sodium hydroxide & dilute to 250 ml with distilled water. Dilute 1 ml of this solution to 100 ml with distilled water.

 [Store this solution at room temperature in Borosil glass bottles with well-fitted suitable stopper.]